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- Title
New U/Pb and Pb/Pb zircon ages from the Biharia terrane rocks, Apuseni Mountains, Romania.
- Authors
Balintoni, Joan; Balica, Constantin; Cliveti, Monica; Li-qiu Li; Peter Hann, Horst; Fukun Chen; Schuller, Volker
- Abstract
The Biharia sequence from the Apuseni Mountains is a component of the Biharia Paleozoic terrane. The Biharia terrane probably evolved as an island arc between the Cadoinian Someş and Bia de Arieş terranes. A gneissie metagranodiorite associated with metabasites from the Valca lertii creek, was sampled for U/Pb and Pb/Pb zircon age determination. The zircons extracted out of the sampled rock were subjected both to dilution and evaporation methods. Dilution method offered Concordia intercepts at 227±23 Ma. 312±13 Ma. 465.7+8.41-8.0 Ma, 703±21 Ma and 1604±45 Ma. Evaporated zircon grains gave45O±20 Ma and 543±17 Ma. The 227±23 Ma age and 312±13 Ma age have been interpreted as Pb loss due to the final effect of the Permian widespread magnialisni and late Variscan anatexis respectively. The 465.7+8.4/-8.0 Ma and 450±50 Ma ages probably represent the protolith generation time. The 543±17 Ma is viewed as an inherited Cadomian age and the 703±21 and 1604±45 Ma might represent Cadomian and Saharan detrital zircon ages.
- Subjects
APUSENI Mountains (Romania); ROMANIA; ZIRCON; PALEOZOIC stratigraphic geology; METABASITE; MINERALOGY
- Publication
Studia Universitatis Babes-Bolyai, Geologia, 2006, Vol 51, Issue 1/2, p61
- ISSN
1221-0803
- Publication type
Article
- DOI
10.5038/1937-8602.51.1.9